A bidirectional movable tube extractor

Abstract

This utility model discloses a bidirectional movable drill pipe puller, comprising a base plate, a support plate, and a drive mechanism. The base plate has a positioning hole, the support plate has a clearance hole coaxial with the positioning hole, and a first clamping device and a second clamping device on both sides, adapted to the clearance hole, for clamping and releasing the drill pipe. The drive mechanism drives the support plate to alternately clamp and release the drill pipe, causing the drill pipe to reciprocate relative to the base plate along the axis of the positioning hole. This utility model has the advantages of simple structure, no need for overloading of drilling equipment, ability to alternately clamp and release the drill pipe through the first and second clamping devices, and continuous bidirectional reciprocating movement of the drill pipe relative to the base plate under the drive mechanism, thereby freeing stuck and locked drill pipes. It has strong freeing ability, no damage to equipment and borehole wall, and can adapt to various complex geological conditions, thus avoiding obstruction of construction progress.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, specifically to a bidirectional movable pipe puller. Background Technology

[0002] In the field of tunnel engineering, advanced geological drilling and grouting reinforcement are key processes to ensure construction safety and quality. These processes often require deep-hole drilling operations under complex and variable geological conditions. As the drilling depth increases, the risk of strata instability rises significantly, easily inducing a series of geological anomalies, including but not limited to borehole diameter reduction, borehole wall collapse, and encountering weak interlayers or fracture zones. Such geological anomalies pose a serious threat to the drill pipe system, especially during drilling or retraction, where the drill pipe system is easily blocked or locked by unstable strata, hindering the construction progress.

[0003] When the drill pipe system becomes stuck at depth, the inherent torque and lifting force of the drilling rig itself are often insufficient to overcome the enormous resistance exerted by the formation on the drill pipe. In such cases, external extrication techniques must be employed to restore the normal operation of the drill pipe system. However, in current engineering practice, the main technical solutions adopted for deep hole drill pipe sticking all have varying degrees of limitations, specifically as follows: Overloading equipment: This method attempts to overcome geological resistance by increasing the workload of the equipment, but it is very easy to cause excessive wear and even damage to the equipment, while also increasing construction risks and having limited effectiveness in getting out of trouble.

[0004] Side-hole clearing drilling: This method involves drilling side holes around the jammed drill rod to clear the strata. However, this method is inefficient and may damage the existing borehole structure, affecting subsequent construction.

[0005] Vibration / impact release: This method attempts to separate the drill pipe from the formation using vibration or impact. However, this method requires sophisticated equipment and is not very effective under complex geological conditions, with limited ability to extricate the drill pipe from the formation.

[0006] Application of chemical unblocking agents: Chemical unblocking agents are injected to soften or break down the formation, reducing resistance to the drill pipe. However, this method has high environmental requirements, may cause environmental pollution, and is also costly.

[0007] In-hole cutting and disposal: In extreme cases, it may be necessary to cut and discard stuck drill pipe inside the hole. This not only wastes the drill bit, but may also affect the overall construction progress and cost. Summary of the Invention

[0008] The technical problem to be solved by this utility model is to provide a bidirectional movable pipe puller with a simple structure that does not require the drilling equipment to be overloaded. It can alternately clamp and release the drill rod through the first and second clamping devices set on both sides of the support plate. Under the drive of the drive mechanism, the support plate drives the drill rod to move back and forth in both directions relative to the bottom plate, thereby freeing the jammed and locked drill rod. It has a strong freeing ability, does not damage the equipment and the borehole wall, and can adapt to various complex geological conditions, thus avoiding the obstruction of the construction process.

[0009] To solve the above-mentioned technical problems, the present invention provides a bidirectional movable pipe puller, comprising a base plate, a support plate disposed opposite to the base plate, and a drive mechanism. The base plate is provided with a positioning hole, the support plate is provided with a clearance hole coaxially disposed with the positioning hole, a first clamping device adapted to the clearance hole for clamping and releasing the drill rod is provided on the side away from the base plate, and a second clamping device disposed on the side close to the base plate opposite to the first clamping device for clamping and releasing the drill rod. The output end of the drive mechanism is connected to the support plate, and is used to drive the support plate to move the drill rod back and forth relative to the base plate along the axis of the positioning hole under the alternating clamping and releasing action of the first clamping device and the second clamping device.

[0010] In a preferred embodiment, the first clamping device includes at least a first clamping sleeve extending outward from the support plate, a first split clamping sleeve, and a first anti-disengagement sleeve covering the first clamping sleeve; The inner wall of the slip sleeve is provided with a first conical surface that gradually tapers along the anti-disengagement sleeve towards the support plate. The segmented slip is adapted to the first conical surface and can be slidably installed inside the slip sleeve.

[0011] In a preferred embodiment, the segmented slip includes at least two slip pieces spaced apart around the axis of the clearance hole.

[0012] In a preferred embodiment, the inner wall surface of the segmented slip is provided with a first serrated protrusion for increasing friction.

[0013] In a preferred embodiment, at least one reinforcing rib extending toward the support plate is provided at intervals on the outer surface of the slip sleeve.

[0014] In a preferred embodiment, the second clamping device includes at least a second clamping sleeve extending outward from the support plate, a second split clamping sleeve, and a second anti-disengagement sleeve covering the first clamping sleeve; The inner wall of the second slip sleeve is provided with a second conical surface that is symmetrical to the first conical surface. The second segmented slip sleeve is adapted to the second conical surface and can be slidably installed inside the second slip sleeve.

[0015] In a preferred embodiment, the segmented slip includes at least two slips spaced apart around the axis of the clearance hole.

[0016] In a preferred embodiment, the second anti-detachment sleeve is detachably connected to the end of the second slip sleeve away from the support plate.

[0017] In a preferred embodiment, the inner wall surface of the segmented slip is provided with a second serrated protrusion for increasing friction.

[0018] In a preferred embodiment, the driving mechanism includes a first hydraulic cylinder and a second hydraulic cylinder symmetrically arranged on the base plate, wherein the piston rod ends of the first hydraulic cylinder and the second hydraulic cylinder are respectively fixedly connected to the support plate.

[0019] Compared with the prior art, the bidirectional movable tube puller of this utility model has the following advantages: (1) The bidirectional movable pipe puller of this utility model includes a base plate, a support plate opposite to the base plate, and a drive mechanism. The base plate is provided with a positioning hole, and the support plate is provided with a clearance hole coaxially arranged with the positioning hole, forming a simple, independently operating force application platform that is separate from the drilling equipment. This eliminates the need for the drilling equipment to operate under overload, thereby avoiding the problem of excessive wear or even damage to the equipment and increasing construction risks. A first clamping device adapted to the clearance hole is provided on the side away from the base plate for clamping and releasing the drill rod, and a second clamping device opposite to the first clamping device is provided on the side closer to the base plate for clamping and releasing the drill rod. The output end of the drive mechanism is connected to the support plate and is used to drive the support plate to move relative to the base plate along the axis of the positioning hole. When the drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole, the first clamping device clamps the drill rod, and the second clamping device releases the drill rod; when the drive mechanism drives the support plate to move closer to the base plate along the axis of the positioning hole, the first clamping device releases the drill rod, and the second clamping device clamps the drill rod. By alternately clamping and releasing the drill rod using the first and second clamping devices, and with the assistance of the drive mechanism, the drill rod is driven to reciprocate continuously relative to the base plate, applying thrust and pull forces. This loosens and frees the stuck and locked drill rod from the formation, demonstrating strong freeing ability and high efficiency, thus avoiding obstruction of the construction process. On the one hand, it eliminates the need for chemical unblocking agents and is unaffected by formation conditions and the environment; on the other hand, it does not damage the existing borehole structure, protecting the construction results.

[0020] (2) The bidirectional movable tube puller of this utility model includes at least a first clamping device comprising a first clamping sleeve extending outward from the support plate, a first segmented clamping sleeve, and a first anti-disengagement sleeve covering the first clamping sleeve; the inner wall surface of the first clamping sleeve is provided with a first conical surface that gradually narrows along the direction of the anti-disengagement sleeve toward the support plate, and the first segmented clamping sleeve is adapted to the first conical surface and can be slidably installed inside the first clamping sleeve. On the one hand, the drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole. The movement of the drill rod will cause the split-type slip to slide in the first conical surface. Under the action of the first conical surface, the split-type slip contracts towards the axis of the relief hole, converting the axial force of the cylinder into a huge radial clamping force of the split-type slip on the drill rod. This ensures that even under extremely high loads, the drill rod will not slip out of the slip, avoiding the problem of drill rod slippage and limited escape ability when the equipment is overloaded in the existing technology. On the other hand, the "split-type" slip can deform slightly in the radial direction to adapt to the outer diameter of the drill rod, increasing the contact area and making the pressure distribution more uniform, avoiding stress concentration damage to the surface of the drill rod.

[0021] The second clamping device includes at least a second clamping sleeve extending outward from the support plate, a second segmented clamping sleeve, and a second anti-disengagement sleeve covering the first clamping sleeve. The inner wall of the second clamping sleeve has a second conical surface symmetrically arranged with the first conical surface. The second segmented clamping sleeve is adapted to the second conical surface and can be slidably installed within the second clamping sleeve. On one hand, the drive mechanism drives the support plate to move closer to the base plate along the axis of the positioning hole. The movement of the drill rod causes the first segmented clamping sleeve to slide within the first conical surface. Under the action of the first conical surface, the first segmented clamping sleeve expands outward away from the clearance hole, thus releasing the drill rod. Simultaneously, the movement of the drill rod causes the second segmented clamping sleeve to slide within the second conical surface. Under the action of the second conical surface, the second segmented clamping sleeve contracts towards the axis of the clearance hole, converting the axial force of the hydraulic cylinder into a large radial clamping force of the second segmented clamping sleeve on the drill rod. This achieves the alternating clamping of the first and second clamping devices without the need for an additional drive mechanism. The system releases the drill rod, thereby transmitting the axial force of the hydraulic cylinder to the drill rod. Under continuous and repeated bidirectional force, the stuck and locked drill rod is loosened and freed from the formation. The structure is simple and low in cost. On the other hand, the mechanical properties of the two clamping devices are completely equivalent when subjected to tensile and thrust forces. Whether the pipe puller is performing "pulling" or "pushing" operations, it can provide the same strong clamping force. The high-frequency, reciprocating short-stroke pushing and pulling creates a continuous and controllable impact vibration on the jamming point, which can effectively loosen the drill rod "locked" by the formation, ensuring the effectiveness and reliability of the bidirectional freeing action.

[0022] The end of the anti-disengagement sleeve two away from the support plate is detachably connected to the slip sleeve two, allowing for easy separation of the split slip two from the slip sleeve two. The drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole. The movement of the drill rod causes the split slip one to slide within the first conical surface. Under the action of the first conical surface, the split slip one retracts towards the axis of the relief hole, converting the axial force of the hydraulic cylinder into a large radial clamping force on the drill rod from the split slip pair. This causes the stuck and locked drill rod to loosen and escape in the formation. The drive mechanism then drives the support plate to move closer to the base plate along the axis of the positioning hole. The movement of the drill rod causes the split slip one to slide within the first conical surface. Under the action of the first conical surface, the split slip one expands outward away from the relief hole, thus releasing the drill rod. This achieves a continuous unidirectional drill rod pulling operation mode, enabling efficient and continuous recovery of stuck or normal drill rods. This utility model features multiple operating modes, including "powerful loosening" and "continuous recycling," allowing operators to flexibly select or combine these two modes according to the severity of the obstruction on site, forming a complete solution from "unblocking" to "recycling." Attached Figure Description

[0023] Figure 1 This is an exploded view of the overall structure of the bidirectional movable tube puller of this utility model; Figure 2 This is a cross-sectional view of the overall structure of the bidirectional movable tube puller of this utility model.

[0024] Explanation of reference numerals in the attached figures: 1-Base plate; 11-Positioning holes; 2-Support plate; 21-Allowing hole; 22-First clamping device; 221-Clamping slip sleeve one; 2211-First conical surface; 2212-Reinforcing rib; 222-Segmented clamping slip one; 2221-Clamping slip piece one; 2222-First serrated protrusion; 223-Anti-disengagement sleeve one; 23-Second clamping device; 231-Clamping slip sleeve two; 2311-Second conical surface; 232-Segmented clamping slip two; 2321-Clamping slip piece two; 2322-Second serrated protrusion; 233-Anti-disengagement sleeve two; 3-Drive mechanism; 31-First hydraulic cylinder; 32-Second hydraulic cylinder. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] The bidirectional movable tube puller of this embodiment, such as Figure 1 and Figure 2 As shown, the system includes a base plate 1, a support plate 2 opposite to the base plate, and a drive mechanism 3. The base plate has a positioning hole 11, and the support plate has a clearance hole 21 coaxially arranged with the positioning hole. A first clamping device, adapted to the clearance hole 21, is located on the side away from the base plate for clamping and releasing the drill rod, and a second clamping device 23, opposite to the first clamping device, is located on the side closer to the base plate for clamping and releasing the drill rod. This constitutes a simple, independently operating force-applying platform separate from the drilling rig, eliminating the need for the drilling rig to operate under overload conditions and thus avoiding excessive wear or damage that could increase construction risks. The output end of the drive mechanism is connected to the support plate, driving the support plate to move the drill rod reciprocally relative to the base plate along the axis of the positioning hole under the alternating clamping and releasing action of the first and second clamping devices. In this embodiment, the drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole, the first clamping device clamps the drill rod, and the second clamping device releases the drill rod; conversely, the drive mechanism drives the support plate to move closer to the base plate along the axis of the positioning hole, the first clamping device releases the drill rod, and the second clamping device clamps the drill rod. By alternately clamping and releasing the drill rod with the first and second clamping devices, and with the cooperation of the drive mechanism, the drill rod is alternately driven to continuously reciprocate relative to the base plate, applying thrust and pull, thereby loosening and freeing the stuck and locked drill rod in the formation. This method has strong freeing ability, high efficiency, and avoids obstruction of the construction process. On the one hand, it does not require the application of chemical unblocking agents and is unaffected by formation conditions and the environment; on the other hand, it does not damage the existing borehole structure, protecting the construction results.

[0029] First clamping device 22, such as Figure 1 and Figure 2As shown, it includes at least a locking sleeve 221 extending outward from the support plate, a segmented locking sleeve 222, and an anti-disengagement sleeve 223 covering the locking sleeve 221. The inner wall of the locking sleeve 221 is provided with a first conical surface 2211 that gradually tapers along the anti-disengagement sleeve towards the support plate. The segmented locking sleeve is adapted to the first conical surface and can be slidably installed inside the locking sleeve 221. On the one hand, the drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole. The movement of the drill rod will cause the split-type slip to slide in the first conical surface. Under the action of the first conical surface, the split-type slip contracts towards the axis of the relief hole, converting the axial force of the cylinder into a huge radial clamping force of the split-type slip on the drill rod. This ensures that even under extremely high loads, the drill rod will not slip out of the slip, avoiding the problem of drill rod slippage and limited escape ability when the equipment is overloaded in the existing technology. On the other hand, the "split-type" slip can deform slightly in the radial direction to adapt to the outer diameter of the drill rod, increasing the contact area and making the pressure distribution more uniform, avoiding stress concentration damage to the surface of the drill rod.

[0030] The segmented slip 222 includes at least two slip pieces 2221 spaced apart around the axis of the clearance hole. In this embodiment, the segmented slip 222 is composed of three slip pieces evenly spaced apart. On the one hand, the three slip pieces are evenly distributed along the circumference, forming a stable force-sealing structure. When the slip pieces contract under the action of the first conical surface, they can apply an isotropic and uniform radial clamping force to the drill rod, effectively avoiding local pressure damage, bending, or stress concentration of the drill rod caused by uneven clamping force, and ensuring the integrity and reusability of the drill rod. On the other hand, the three evenly distributed support points ensure that the drill rod is always in a centered state, preventing the drill rod from swaying or the slip pieces from "single-sided seizing" abnormal state under the action of huge axial force.

[0031] The inner wall of the segmented slip 222 is provided with a first serrated protrusion 2222 to increase friction. On the one hand, under the same axial force, the required radial clamping force can be relatively reduced, which reduces the area pressure (pressure) of the slip on the drill pipe body, helps to reduce indentation damage to the drill pipe surface, and better protects the drill pipe body while achieving powerful freeing. On the other hand, under adverse conditions such as wet drill pipe surface, oil or mud, the smooth inner wall of the slip is prone to slipping, while the first serrated protrusion design can effectively penetrate these contaminants, maintain reliable clamping effect, and significantly improve the adaptability and reliability of the equipment in complex and harsh tunnel construction environments.

[0032] The outer surface of the slip sleeve 221 is provided with at least one reinforcing rib 2212 extending toward the support plate 2 at intervals. In this embodiment, four reinforcing ribs are uniformly and symmetrically distributed.

[0033] The second clamping device adopts the same structural design as the first clamping device. The core components (such as the segmented slips, slip sleeves, and anti-disengagement sleeves) in both devices are completely interchangeable. This greatly reduces the types of parts, simplifies supply chain management, and lowers production and inventory costs. Furthermore, during on-site maintenance, maintenance personnel only need to carry one set of spare parts to handle potential damage at both ends, significantly reducing maintenance costs and inventory pressure. Figure 1 and Figure 2 As shown, the second clamping device includes at least a second clamping sleeve 231 extending outward from the support plate, a second segmented clamping sleeve 232, and a second anti-disengagement sleeve 233 covering the first clamping sleeve. The inner wall of the second clamping sleeve 231 is provided with a second conical surface 2311 symmetrically arranged with the first conical surface. The second segmented clamping sleeve is adapted to the second conical surface and can be slidably installed within the second clamping sleeve. On one hand, the drive mechanism drives the support plate to move closer to the base plate along the axis of the positioning hole. The movement of the drill rod causes the first segmented clamping sleeve to slide within the first conical surface. Under the action of the first conical surface, the first segmented clamping sleeve expands outward away from the clearance hole, thus releasing the drill rod. Simultaneously, the movement of the drill rod causes the second segmented clamping sleeve to slide within the second conical surface. Under the action of the second conical surface, the second segmented clamping sleeve contracts towards the axis of the clearance hole, converting the axial force of the hydraulic cylinder into a large radial clamping force of the second segmented clamping sleeve on the drill rod. This achieves the alternating clamping of the first and second clamping devices without the need for an additional drive mechanism. The system releases the drill rod, thereby transmitting the axial force of the hydraulic cylinder to the drill rod. Under continuous and repeated bidirectional force, the stuck and locked drill rod is loosened and freed from the formation. The structure is simple and low in cost. On the other hand, the mechanical properties of the two clamping devices are completely equivalent when subjected to tensile and thrust forces. Whether the pipe puller is performing "pulling" or "pushing" operations, it can provide the same strong clamping force. The high-frequency, reciprocating short-stroke pushing and pulling creates a continuous and controllable impact vibration on the jamming point, which can effectively loosen the drill rod "locked" by the formation, ensuring the effectiveness and reliability of the bidirectional freeing action.

[0034] The segmented slip 232 includes at least two slip pieces 2321 spaced apart around the axis of the clearance hole. In this embodiment, the segmented slip 232 is composed of three slip pieces 2321 evenly spaced apart.

[0035] The anti-dislodgement sleeve 233 and the slip sleeve 231 are detachably connected at the end away from the support plate, allowing for easy separation of the split slip 2 from the slip sleeve 2. The drive mechanism drives the support plate to move away from the base plate along the axis of the positioning hole. The movement of the drill rod causes the split slip 1 to slide within the first conical surface. Under the action of the first conical surface, the split slip 1 contracts towards the axis of the relief hole, converting the axial force of the cylinder into a large radial clamping force on the drill rod from the split slip pair. This causes the stuck and locked drill rod to loosen and escape in the formation. The drive mechanism then drives the support plate to move closer to the base plate along the axis of the positioning hole. The movement of the drill rod causes the split slip 1 to slide within the first conical surface. Under the action of the first conical surface, the split slip 1 expands outward away from the relief hole, thus releasing the drill rod. This achieves a continuous unidirectional drill rod pulling operation mode, enabling efficient and continuous recovery of stuck or normal drill rods. This utility model features multiple operating modes, including "powerful vibration loosening" and "continuous recovery," allowing operators to flexibly select or combine these two modes according to the severity of the obstruction, forming a complete solution from "unblocking" to "recovery." In this embodiment, the anti-disengagement sleeve and the slip sleeve are also detachably connected for easy on-site maintenance.

[0036] The inner wall surface of the split-type 232 is provided with a second serrated protrusion 2322 to increase friction.

[0037] The drive mechanism 3 includes a first hydraulic cylinder 31 and a second hydraulic cylinder 32 that are symmetrically arranged on the base plate 1. The piston rod ends of the first hydraulic cylinder and the second hydraulic cylinder are respectively fixedly connected to the support plate.

[0038] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bidirectional movable tube puller, comprising a base plate (1), a support plate (2) disposed opposite to the base plate, and a drive mechanism (3), wherein the base plate is provided with a positioning hole (11), characterized in that: The support plate is provided with a clearance hole (21) coaxially arranged with the positioning hole, a first clamping device (22) adapted to the clearance hole (21) for clamping and releasing the drill rod is provided on the side away from the bottom plate, and a second clamping device (23) opposite to the first clamping device for clamping and releasing the drill rod is provided on the side close to the bottom plate. The output end of the drive mechanism is connected to the support plate, and is used to drive the support plate to move the drill rod back and forth relative to the base plate along the axis of the positioning hole under the alternating clamping and releasing action of the first clamping device and the second clamping device.

2. A bidirectional movable tube puller according to claim 1, characterized in that: The first clamping device (22) includes at least a clamping sleeve (221) extending outward from the support plate, a split clamping sleeve (222), and an anti-disengagement sleeve (223) covering the clamping sleeve. The inner wall of the first slip sleeve (221) is provided with a first conical surface (2211) that gradually narrows along the direction of the first slip sleeve toward the support plate. The split slip is adapted to the first conical surface and can be slidably installed inside the first slip sleeve.

3. A bidirectional movable tube puller according to claim 2, characterized in that: The segmented slip (222) includes at least two slip pieces (2221) spaced apart around the axis of the relief hole.

4. A bidirectional movable tube puller according to claim 2 or 3, characterized in that: The inner wall surface of the segmented slip (222) is provided with a first serrated protrusion (2222) for increasing friction.

5. A bidirectional movable tube puller according to claim 4, characterized in that: The outer surface of the slip sleeve (221) is provided with at least one reinforcing rib (2212) extending toward the support plate (2) at intervals.

6. A bidirectional movable tube puller according to any one of claims 2, 3 or 5, characterized in that: The second clamping device (23) includes at least a second clamping sleeve (231) extending outward from the support plate, a second split clamping sleeve (232), and a second anti-disengagement sleeve (233) covering the first clamping sleeve. The inner wall of the second slip sleeve (231) is provided with a second conical surface (2311) that is symmetrical to the first conical surface. The second slip sleeve is adapted to the second conical surface and can be slidably installed inside the second slip sleeve.

7. A bidirectional movable tube puller according to claim 6, characterized in that: The segmented slip 2 (232) includes at least two slip pieces 2321 arranged at intervals around the axis of the relief hole.

8. A bidirectional movable tube puller according to claim 7, characterized in that: The anti-detachment sleeve 2 (233) and the slip sleeve 2 (231) at the end away from the support plate are detachably connected.

9. A bidirectional movable tube puller according to claim 7 or 8, characterized in that: The inner wall surface of the split-type kava 2 (232) is provided with a second serrated protrusion (2322) for increasing friction.

10. A bidirectional movable tube puller according to any one of claims 1-3, 5 or 7-8, characterized in that: The drive mechanism (3) includes a first hydraulic cylinder (31) and a second hydraulic cylinder (32) installed symmetrically on the base plate (1), and the piston rod ends of the first hydraulic cylinder and the second hydraulic cylinder are respectively fixedly connected to the support plate.

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